Soil mechanical properties change with increasing humidity and saturation. In some soils, due to increased humidity, certain phenomena sometimes lead to damages in construction projects. These soils are called water-sensitive soils (Askari & Fakher, 1995). One type of these soils is dispersive soil. Dispersive means the separation of fine particles from each other, which leads to soil erosion. Divergence is a phenomenon in which soil particles float due to contact with water and exit the ambiance because of the force generated by water flow. It can be physical-chemical (clay) or physical (fine sand and non-cohesive silt). The erosion of clay particles mainly triggers to overcome repulsive forces between particles. In contrast, the transfer of particles in fine-grained sand is due to their lack of adhesion and small size. This action causes internal erosion in the soil (Rahimi et al., 2004). As a result, a divergence is a progressive event that begins with water flow from one point and gradually expands. Recent experiences have shown that insufficient attention to this phenomenon has caused adverse effects. The scouring of many earth dams, the walls of canals, and even the possible failure of structures, especially in the vicinity of areas bordering water, are examples of such problems (Sarshar, 1992). So far, extensive research has been carried out on the chemical divergence of soils, and therefore, numerous chemical and physical methods have been proposed for their determination. Although most scientists who have studied divergent soils have pointed to the physical divergence of soil, a comprehensive study on how and why divergence of these soils occurs and a basis for their identification and classification have yet to be addressed appropriately.